Several years ago, the interrupt priority levels for devices were "flattened"
such that IPL_BIO, IPL_NET, and IPL_TTY (logical interrupt priority levels)
became aliases of IPL_VM (the logical interrupt priority level above which
memory allocation is not allowed). Unfortuantely, this meant that any
use of these logical interrupt priority levels to differentiate between
different interrupt service routines at the same auto-vectored interrupt
level was pointless... "when everyone is special, no one is".
Before this flattening happened, these distinct logical interrupt priority
levels levels were dynamically mapped to physical auto-vectored interrupt
levels based on which types of devices registered themselves at which auto-
vectored level. Now, splbio(), splnet(), etc. are all equivalent to splvm(),
which effectively blocks all device interrupts.
Switch to using the ISRPRI_* values provided by the common m68k interrupt
dispatch code, which allows interrupt handlers for devices that are more
latency-sensitive to be sorted earlier in the list of handlers at a given
auto-vectored interrupt level, as was originally intended.
2024-01-16 08:48:28 +03:00
|
|
|
/* $NetBSD: com_dio.c,v 1.10 2024/01/16 05:48:28 thorpej Exp $ */
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2003-11-08 14:18:33 +03:00
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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|
|
|
* modification, are permitted provided that the following conditions
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|
|
* are met:
|
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|
|
* 1. Redistributions of source code must retain the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer.
|
|
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer in the
|
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|
|
* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)com.c 7.5 (Berkeley) 5/16/91
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*/
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#include <sys/cdefs.h>
|
Several years ago, the interrupt priority levels for devices were "flattened"
such that IPL_BIO, IPL_NET, and IPL_TTY (logical interrupt priority levels)
became aliases of IPL_VM (the logical interrupt priority level above which
memory allocation is not allowed). Unfortuantely, this meant that any
use of these logical interrupt priority levels to differentiate between
different interrupt service routines at the same auto-vectored interrupt
level was pointless... "when everyone is special, no one is".
Before this flattening happened, these distinct logical interrupt priority
levels levels were dynamically mapped to physical auto-vectored interrupt
levels based on which types of devices registered themselves at which auto-
vectored level. Now, splbio(), splnet(), etc. are all equivalent to splvm(),
which effectively blocks all device interrupts.
Switch to using the ISRPRI_* values provided by the common m68k interrupt
dispatch code, which allows interrupt handlers for devices that are more
latency-sensitive to be sorted earlier in the list of handlers at a given
auto-vectored interrupt level, as was originally intended.
2024-01-16 08:48:28 +03:00
|
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|
__KERNEL_RCSID(0, "$NetBSD: com_dio.c,v 1.10 2024/01/16 05:48:28 thorpej Exp $");
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2003-11-08 14:18:33 +03:00
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/termios.h>
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#include <sys/ttydefaults.h>
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#include <machine/bus.h>
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#include <dev/ic/comreg.h>
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#include <dev/ic/comvar.h>
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#include <hp300/dev/diovar.h>
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#include <hp300/dev/diodevs.h>
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#include <hp300/dev/com_dioreg.h>
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#include <hp300/dev/com_diovar.h>
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struct com_dio_softc {
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struct com_softc sc_com; /* real "com" softc */
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/* DIO-specific goo. */
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struct bus_space_tag sc_tag; /* device specific bus space tag */
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void *sc_ih; /* interrupt handler */
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};
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2008-03-14 18:09:09 +03:00
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static int com_dio_match(device_t, cfdata_t , void *);
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static void com_dio_attach(device_t, device_t, void *);
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2003-11-08 14:18:33 +03:00
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2008-03-14 18:09:09 +03:00
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CFATTACH_DECL_NEW(com_dio, sizeof(struct com_dio_softc),
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2003-11-08 14:18:33 +03:00
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com_dio_match, com_dio_attach, NULL, NULL);
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static int com_dio_speed = TTYDEF_SPEED;
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static struct bus_space_tag comcntag;
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#define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */
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2004-08-28 21:37:00 +04:00
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static int
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2008-03-14 18:09:09 +03:00
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com_dio_match(device_t parent, cfdata_t match, void *aux)
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2003-11-08 14:18:33 +03:00
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{
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struct dio_attach_args *da = aux;
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switch (da->da_id) {
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case DIO_DEVICE_ID_DCA0:
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case DIO_DEVICE_ID_DCA0REM:
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case DIO_DEVICE_ID_DCA1:
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case DIO_DEVICE_ID_DCA1REM:
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return 1;
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}
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return 0;
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}
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2004-08-28 21:37:00 +04:00
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static void
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2008-03-14 18:09:09 +03:00
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com_dio_attach(device_t parent, device_t self, void *aux)
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2003-11-08 14:18:33 +03:00
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{
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2008-03-14 18:09:09 +03:00
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struct com_dio_softc *dsc = device_private(self);
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2003-11-08 14:18:33 +03:00
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struct com_softc *sc = &dsc->sc_com;
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bus_space_tag_t iot;
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bus_space_handle_t iohdca, iohcom;
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struct dio_attach_args *da = aux;
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int isconsole;
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2008-03-14 18:09:09 +03:00
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sc->sc_dev = self;
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2003-11-08 14:18:33 +03:00
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isconsole = com_is_console(&comcntag, da->da_addr + DCA_COM_OFFSET,
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&iohcom);
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if (isconsole) {
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iot = &comcntag;
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bus_space_unmap(iot, iohcom, COM_NPORTS);
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} else {
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iot = &dsc->sc_tag;
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memcpy(iot, da->da_bst, sizeof(struct bus_space_tag));
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dio_set_bus_space_oddbyte(iot);
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}
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if (bus_space_map(iot, da->da_addr, DCA_SIZE, 0, &iohdca) ||
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bus_space_subregion(iot, iohdca, DCA_COM_OFFSET,
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COM_NPORTS << 1, &iohcom)) {
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2008-03-14 18:09:09 +03:00
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aprint_error(": can't map i/o space\n");
|
2003-11-08 14:18:33 +03:00
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return;
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}
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if (!isconsole) {
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bus_space_write_1(iot, iohdca, DCA_RESET, 0xff);
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DELAY(1000);
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}
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2018-12-08 20:46:09 +03:00
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com_init_regs(&sc->sc_regs, iot, iohcom,
|
2006-07-14 02:56:00 +04:00
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da->da_addr + DCA_COM_OFFSET);
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2003-11-08 14:18:33 +03:00
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sc->sc_frequency = COM_DIO_FREQ;
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com_attach_subr(sc);
|
|
|
|
|
Several years ago, the interrupt priority levels for devices were "flattened"
such that IPL_BIO, IPL_NET, and IPL_TTY (logical interrupt priority levels)
became aliases of IPL_VM (the logical interrupt priority level above which
memory allocation is not allowed). Unfortuantely, this meant that any
use of these logical interrupt priority levels to differentiate between
different interrupt service routines at the same auto-vectored interrupt
level was pointless... "when everyone is special, no one is".
Before this flattening happened, these distinct logical interrupt priority
levels levels were dynamically mapped to physical auto-vectored interrupt
levels based on which types of devices registered themselves at which auto-
vectored level. Now, splbio(), splnet(), etc. are all equivalent to splvm(),
which effectively blocks all device interrupts.
Switch to using the ISRPRI_* values provided by the common m68k interrupt
dispatch code, which allows interrupt handlers for devices that are more
latency-sensitive to be sorted earlier in the list of handlers at a given
auto-vectored interrupt level, as was originally intended.
2024-01-16 08:48:28 +03:00
|
|
|
dsc->sc_ih = dio_intr_establish(comintr, sc, da->da_ipl, ISRPRI_TTY);
|
2003-11-08 14:18:33 +03:00
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/* Enable interrupts. */
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bus_space_write_1(iot, iohdca, DCA_IC, IC_IE);
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}
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int
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com_dio_cnattach(bus_space_tag_t bst, bus_addr_t addr, int scode)
|
|
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{
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bus_space_tag_t iot = &comcntag;
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bus_space_handle_t iohdca;
|
2005-01-02 15:03:12 +03:00
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uint8_t id;
|
2003-11-08 14:18:33 +03:00
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memcpy(iot, bst, sizeof(struct bus_space_tag));
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dio_set_bus_space_oddbyte(iot);
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if (bus_space_map(iot, addr, DCA_SIZE, 0, &iohdca))
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return 1;
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bus_space_write_1(iot, iohdca, DCA_RESET, 0xff);
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DELAY(100);
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bus_space_write_1(iot, iohdca, DCA_IC, IC_IE);
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id = bus_space_read_1(iot, iohdca, DCA_ID);
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bus_space_unmap(iot, iohdca, DCA_SIZE);
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switch (id) {
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#ifdef CONSCODE
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case DCAID0:
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case DCAID1:
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#endif
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case DCAREMID0:
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case DCAREMID1:
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|
break;
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|
default:
|
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|
return 1;
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|
|
|
}
|
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|
comcnattach(iot, addr + DCA_COM_OFFSET, com_dio_speed, COM_DIO_FREQ,
|
|
|
|
COM_TYPE_NORMAL, CONMODE);
|
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|
return 0;
|
|
|
|
}
|